I'll take it a step further: season 3 as a whole was a disappointment. It strikes me very much as an afterthought, on a lot of fronts.
On aesthetics, I still really don't like the change of art style, with the dead eyes it gave certain characters (looking at you, Pipkin). It looks weird to me. And I cannot stand the accessories they gave the Dark Haven rabbits. Spartina's weird feather earring thing just looks straight out of DeviantArt to me.
On plot, Dark Haven comes out of nowhere. The tortoise and the magic she gives to Hannah come out of nowhere. The magical tornado that sucks up Woundwort and his army at the end is a total cop-out and may as well be a deus ex machina. I don't believe anything that happens in the season would happen in the world of Watership Down. These are still supposed to be relatively natural rabbits. There were moments in previous seasons I didn't believe, but this one just ramps it up.
On characters, to put it bluntly, I don't care about a lot of them. Spartina's arc makes me think there's an episode missing where she bonded more with Bigwig and showed more of who she is. Don't care about her. I don't like the characterization they gave Silverweed, and I don't like that they made him another seer and tried to make him likeable I understand why they did that for plot reasons, but I never warmed to him. I don't think I have to talk about new additions like Gluck or Skree, though, oddly, I don't mind either of them as much as some. The existing characters are fine I guess. Mostly no better, no worse as far as characterization goes. I just wish a hawk would carry off Pipkin; he looks and sounds like he's in pain the entire season by virtue of existing.
It's not a terrible story they tell. I generally enjoy it for what it is, but it strays so far from the world and ideas the book set up that I can't help but think of it as the post-jumped the shark season. The jump the shark moment being Woundwort having a heel face turn. No. No, you do not do that with Woundwort, that's not okay. It's like having Big Brother suddenly renounce his ways, it's incomprehensible. Even if he goes completely nuts right after.
But really, the best thing about season 3 was seeing Vervain stick it to Woundwort when they've been bagged by a poacher. That was great. I really like Vervain, still my favorite character by far. I'll take season 3 purely to have more of goat-bunny Starscream.
That got long. I have too much time on my hands. Pls no hurt me, is only opinion.